Six months after my younger sister Rika and her husband moved into an apartment managed by my uncle, my older sister and Itsuki also moved next door. There was nothing dissatisfied with her life with her good friend Itsuki, but Rika had a problem. It's the shadow of the opposite sex that she feels in her husband, the betrayal of her husband that she knows because she's always been by her side. However, Rika was waiting for a strong stimulus to counteract her growing anxiety. The relationship between her "husband and sister" that her brother-in-law told me about... And Rika's body that has been embraced by her brother-in-law, and...
